GENETIC PERformance for Yiled and Growth Indicators in Early Generation for Partial Diallel Crosses of ManyBarley Genotypes .

Abstract

The study includedwas using parial Dihyrid cross between ten genotypes which were (Shuaa, Boraq , Emal , Samir , Warkaa and Al- khair) with some advanced lines wihch were (JH24, JH21, JH29 and JH7-1). Study of traits, duration from planting till 75% flowering , number of days planting till maturity , plant height , flag leaf aear , number of tillers/m2, number of Spikes/m2, fertility ratio , spoike length , number of grains in the sipke , weight of 1000 grains yield and biological yield . Mean squares of the crosses and General and specific combinig ability were differed significantly at 1% prob . level for all the traits , the ratio between components of variance of Genral combing ability and componeats of specific combining ability was less than one for all the traits , the crosses were distinguished in its perfor mance , for exam ple the cross (shuaa x JH24) in number of tillers and number of spikes per plant traits (22 and 18) respectively , and the cross (Bouraq x JH24) in singel plant yield and the cross (Emal x Al-warkaa) in flay leaf aerea and number of sipke grains traits and the cross (Al-khair x JH29) in duration to 75% flowering and the duration to maturity. The two crosses (Shuaa x JH10 and shuaa x JH24) in heterosis as deviated on mid and best parents in eleven traits and the two crosses (El-warkaa x JH29 , JH29 X Al-khair ) in eiqht traits and the two crosses (Boraq x El-khain and Emal x JH10) in seven traits . Effects of General Combining ability showed good in desired direction , where the parent (Boraq) was significant for seven traits (number of spike in the plant , number of tillers , weight of 1000 grains , single plant yield , fertility ratio , flay leaf aerea and biologcal yield) also the parent (JH29) for seven traits included (number of days from planting to 75% flowering the duration to the maturity , spike length , number yield and biological yield ) .Dominance genetic variance values were higher than additive genetic variance values for all the traits unless weight of 1000 grains and grains yield traits , the mean dgree of dominace was larger than one for all the traits .Hertability values in broad sense were heigher , and lower in narrow sense for all the traits .